Fluorine-Directed β-Galactosylation: Chemical Glycosylation Development by Molecular Editing
作者:Estelle Durantie、Christoph Bucher、Ryan Gilmour
DOI:10.1002/chem.201200468
日期:2012.6.25
Validation of the 2‐fluoro substituent as an inert steering group to control chemicalglycosylation is presented. A molecularediting study has revealed that the exceptional levels of diastereocontrol in glycosylation processes by using 2‐fluoro‐3,4,6‐tri‐O‐benzyl glucopyranosyl trichloroacetimidate (TCA) scaffolds are a consequence of the 2R,3S,4S stereotriad. This study has also revealed that epimerization
Cooperative Brønsted Acid-Type Organocatalysis for the Stereoselective Synthesis of Deoxyglycosides
作者:Carlos Palo-Nieto、Abhijit Sau、Ryan Williams、M. Carmen Galan
DOI:10.1021/acs.joc.6b02498
日期:2017.1.6
α-stereoselective synthesis of deoxyglycosides using cooperative Brønsted acid-type organocatalysis has been developed. The method is tolerant of a wide range of glycoside donors and acceptors, and its versatility is exemplified in the one-pot synthesis of a trisaccharide. Mechanistic studies suggest that thiourea-induced acid amplification of the chiral acid via H-bonding is key for the enhancement
Copper-Catalyzed Stereoselective Synthesis of 2-Deoxygalactosides
作者:Jianbo Zhang、Youxian Dong、Madina Yuma、Yuling Mei、Nan Jiang、Guofang Yang、Zhongfu Wang
DOI:10.1055/s-0040-1707098
日期:2020.7
acids, sugars, and phenol, and proceeds with excellent yield and high α-selectivity under mild conditions. The reaction proceeds readily on a gram scale, and its versatility is exemplified in the synthesis of oligosaccharides.